Elevator systems



Aug. 18, 1959 w. F. EAMES 2,900,048

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l1g 18.` 1959 w. F. EAMES 2,900,048

ELEVATOR SYSTEMS J.- BICR Bda Aug. 18, 1959 w. F. EAMES ELEvAToR SYSTEMS6 Sheets-Sheet 6 Filed Oct. l0, 1958 m9 II I I I I I I Ie/ 2E: N5. momIII I I. I FI I9 IOM Zm-ON ION ON mom I I Il. .,Y le. mow 25m mom momzo@ ll LPNS@ z5@ 5w am :217 S mm? .r m. 2 @Ede x .Iain mx @x wI In@ wums @s NE E Q QN ma@ SNL EN om .om owl we@ Fig.3A.

vwhich is assignedv to 2990020.48. ELEvAron SYSTEMS This. inventionrelates to elevator systems and it has particular relation, to anelevator system which basically provides unidirectional selectivecollective elevator service,

Various aspects of the invention are aplicable either to an elevatorsystem having a single elevator car or toa system having multipleelevator cars arranged in a bank. Furtherrnore,` aspects of theinvention are applicable to elevator systems wherein attendants areprovided in the elevator cars for the purpose of operating the elevatorcars or. to automaticv systems wherein the elevator cars may operatewithout car attendants Since the invention is particularly suitable forautomatic elevators, it will, be described with particular reference toan automatic elevator system having a bank of elevator cars.

Elevator'systems'may be designed to provide one or more types ofpassenger service, one of which is unidirectional selective collectiveservice. For unidirectional selective collective opefration'the elevatorsystem may be so` designed that an` elevator car does not accept callsfor Prospective..passengerslocatedr at the various oors of the buildingserved by theelevator Ysystem during one direction of travelof.theelevator car. Thus, if the elevator'car isy loaded at the lowerterminal oor, it proceeds upwardly but failsto stop. in responsej to anycall vfor up service registered by a prospective passenger at anyoftheintermediate floors of thefbuiltling.` Iffdesired, the` elevator. carmay stop, in response tocar calls which are registeredby passengerswithin the elevator car. During the return trip of the elevator car,stops are. made ini'v'response not onlyA to, callsfregistered bypassengers within the elevator cars, but to calls registered by prosfpetive passengers at the` oors aprdached' bfy the elevator car.ySuch,operation is known as down collective service.

In. this type of installation only one corridor push button is required'for each oor stat-ion which isprovided at each floor of the building so:that prospective passengensmay register callsfor elevator service fromeach floor. For, some of the. lloors, calls will be registered not onlyby passengers within the elevator car but by prospective passengerslocated atsuch floors. Consequently, one s top at eachfof these tloorsserves both classes of passengers andF materially increases theeliiciency of the elevator system- Such a System results not only inanimprovement` inefficiency but it permits a. substantial simplificationof circuitsiand a reduction inthe number of circuit components required,as is pointed out in the Eames Patent No.v 2,709,503, which issued May31, 1955, and i W the same assignee as the subject application. i

The down collective system, on the other hand, is open to the criticismthat when a passenger from the lower half ofy thebuilding, for example,wishes to travel to the upper half. of the building, he must enter adown-moving car and thereafter Itravel tothe first floor. Then he mustwait for checar to start again to movein anupward direction. He, mayalso have towait for one or more stops in respense. tov registered carcalls as'he travelsback toward United States Patent O shown instraight'line form of a 2,900,048 Patented Aug. 18, 1959 the floor h eleft. Thereafter, the car will stop at the oor desired by the passenger.From *he passengers point of view, there is a great deal of needlessloss of time before useful car movement starts, that is, movement of thecar from the floor at which he enters the car to the iloor above atwhich he wishes to depart the car. Such loss of time has occurred, ofcourse, because the passenger cannot stop an up-moving car at his floor.i

In accordance with the invention, a basically unidirectional selectivecollective elevator system is provided with a bidirectional selectivecollective feature, overcoming the above-mentioned drawbacks of theformer system while at the same time retaining its advantages. Theimprovement is accomplished in a down collective system, for example, byproviding means whereby a passenger disposed at Ia floor intermediatethe upper and lower terminal floors who wishes to travel to a lioorabove may register a call to stop the next up-moving car, although onlya single door-call push button is provided for each iloor station.

In a preferred embodiment of the invention, means are furnished whichare responsive to special actuation of the single licor-call push buttonprovided for each of the intermediate floors to register up floor callsfor elevator service. Preferably, such means take the form of circuitswhich are responsive to the pressing and holding of a corridor-call pushbutton by a a prospective passenger as an 11p-moving elevator carapproaches the floor associated with that push button. The circuitsoperate to stop the` lip-moving car at the desired floor. Subsequently,the passengerv may enter the elevator car to register a call for a oorabove, after whichv the elevator car moves upwardly to answer such call.In order to register a down call for elevator service from anintermediate tloor, a prospective passenger, instead of pressing andholding the single floor-call push button disposed at his landing, isrequired merely to press and release the push button. Thereafter, thenext down-moving car will stop to answer the call.

It is, therefore, an object of the invention to provide an improvedelevator system basically having unidirectional selective collectiveoperation.

It is an additional object of the Iinvention to provide a basicallyunidirectional selective collective elevatorsystem with a bidirectionalselective collective feature. l

It is a further object of the invention to provide a basically downcollective elevator system with an up collective feature.

It is still another object of the invention to provide an elevatorsystem with la selective collective control system in which either up ordown collective operation may be had at will, as determined by the modeof operation of a single corridor push button disposedat each of thefloors served by the elevator system.

It -is another object of the invention to provide a down collectiveelevator system in which an elevator car may be stopped on its, up tripin response to a oor call by special actuation of the single floor-callpush button furnished for each of the floors.

Other objects of the invention will be apparent from the followingdescription taken in conjunction with the accompanying drawing, inwhich:

Fig. 1 is a schematic View -Withthe electrical circuits portion of anelevator system embodying the invention;

Figs. 2 and 3 are schematic views with electrical circuits showninsti-aight line form of additional portions `of the elevator systemillustrated in Fig. 1;

of the relays and switches of the horizontally aligned drawings aresubstantially in horizontal alignment.

Because of the complexity of the system, a number of conventions hasbeen adopted. Although the invention may be incorporated in an elevatorsystem having various numbers of elevator cars designed to servicevarious iloors or landings of a building, the invention will bedescribed with reference to an elevator system employing two cars forthe purpose of serving a building having six floors or landings. Theelevator cars will be designated by the reference characters A and B.

inasmuch as similar circuits are provided for each of the elevator cars,a component for the elevator car B will be identified by the referencecharacter employed for the corresponding component associated with thecar A, but preceded by the letter B to indicate that the component underconsideration is associated with the elevator car B. it will beunderstood that the elevator car B and all components specific theretomay be omitted if a single-car system is desired.

Relays and switches are employed which may have a number of sets ofcontacts which are substantiallyv simultaneously operated. Each set ofcontacts is identi* fied by the reference character employed for therelay having the contacts followed by a numeral indicating the specificset of contacts. Thus, the reference characters U1 and U3 represent theiirst and third sets of contacts of the up switch U for the elevator carA.

An electromagnetic switch or relay may have make or front contacts. Suchcontacts are closed when the switch or relay is energized andl pickedup. The contacts are open when the switch or relays is deenergized anddropped out. ln addition, relays and switches may have break or backcontacts. Such contacts are closed when a relay or switch is deenergizedand dropped out. The contacts are opened when a relay or switch isenergized and picked up.

To facilitate the presentation of the invention, the following apparatusis listed:

Apparatus for car A: V-Speed relay U-Up switch M-Running relay D-Downswitch G-Holding relay E-lnductor slowdown relay F-Inductor stoppingrelay W-Up preference relay X-Down preference relay 'T-Non-interferencerelay J--Reversing relay DR-Door relay T-Car-call stopping relay 1CR tooCR-Car-call registering relays 78-No-call relay U-Call-above relayApparatus common to all cars:

1DR to dDR-Floor-call relays 1D to D-Down floor-call registering relaysUST-Up stop relay DST-Down stop relay Fig. l shows motor controlcircuits for the elevator cars A and B. For the elevator car A, thecontrol circuits illustrated in Fig. l include a speed relay V, an upswitch U, a car-running relay M, a don/vn switch D, a holding relay G, aslowdown inductor relay E, an inductor stopping relay F, an uppreference relay W, a down preference relay X, a non-interference relay70T and a door relay DR. The control circuits are energized from adirect-current source of electrical energy represented by two buses L1and L2. (The buses BLl and BLZ may be energized from the same source andmay be tied to the buses L1 and L2, respectively, by conductors LT1 andLTZ.)

The elevator car A is connected to a counterweight 10 by means of one ormore ropes 11 which pass over a sheave 12. The sheave 12 is secured to ashaft 13 which is rotated by means of suitable motive means. Althoughany suitable motive means may be employed, it will be assumed that avariable voltage control is ernployed to control the energization of adirect-current motor 14 which has its armature 14A secured to the shaft13. The motor 14 has a field winding 14E which is permanently connectedacross the buses L1 and LZ.

By inspection of Fig. l, it will be noted that the armature 14A and anarmature 15A of a direct-current generator `15, together with a seriesfield winding 15S for the generator, are connected in a loop seriescircuit. The

generator also has a field winding ISF which is separately excited forthe purpose of controlling the direction and magnitude of theenergization of the motor armature 14A.

Because of the large number of circuits employed in an elevator system,it is common practice to provide an elevator system with a floorselector 16. Such a ioor selector may include an insulating panel 16P,on which a plurality of rows of Contact segments is mounted. The oorselector includes a brush carriage 16C which is moved relative to thecontact segments in accordance with motions of the elevator car. Thus,the movement of the brush carriage relative to the contact segmentscorresponds on a reduced scale to the movement of the elevator carrelative to the iloors of the building served by such car. The movementof the brush carriage may be effected by a screw 16S which is mountedfor rotation on the panel 16P and which is in threaded engagement withthe carriage. This screw is coupled through suitable gearing 16G to theshaft 13 for rotation by the shaft.

The brush carriage has a separate brush provided for each of the rows ofcontact segments. Although only two rows of contact segments areillustrated in Fig. l, it Will be understood that as many rows areprovided as are required for the elevator system. For example, as theelevator car proceeds from the lower terminal floor upwardly, a brush bbon the brush carriage successively engages the contact segments b2 tob6. The numerals in the reference characters b2 to b6 represent theiioors with which the contact segments are associated. Thus, as theelevator car approaches the second oor, the brush bb engages the contactsegment b2 to prepare circuits which are completed if the elevator caris to stop at the second floor in response to a call registered by apassenger within the elevator car.

As a further example, the brush cc on the brush carriage successivelyengages the contact segments c2 to c6 which are associated respectivelywith the second to sixth oors. Thus, as the elevator car stops at thesecond floor in response to a car call, the brush cc engages the contactc2 to complete a cancelling or resetting circuit for the purpose ofresetting the car call registered for the second oor.

The shaft 13 also carries a brake drum 17. This brake drum cooperateswith a spring-applied electromagnetically-released brake of conventionalconstruction. Thus, in Fig. l, a brake shoe 17 S is biased against thedrum 17 in braking position by means of a spring (not shown). The shoehas secured thereto a magnetic armature 17M which is associated with areleasing coil or brake coil 17B. When the brake coil 17B is energizedby closure of either of the sets of make contacts U1 or D1, the brakeshoe 417S is retracted against the bias of the spring to release thebrake drum 17 and permit rotation of the shaft 13.

Returning to the generator ield winding ISF, it will be noted that thisfield winding is connected across the buses L1 and L2 through areversing circuit. For example, when the make contacts UZ and U3 areclosed, the-'field winding 15P is connected across the buses with properpolarity for up travel of the elevator car. When the make contacts D2and D3 are closed, the eld windingi 15E :is connected across the buseswith proper polarityl for down 'travel ofthe elevator car. Theenergization of the iield winding 15F may be elected through theresistorwhen the resistor is not shunted by the make contacts V1 of the speedrelay.

The elevator car A contains a plurality of push buttons 1c to 6c lforthe purpose of registering calls by passengers in the elevatorcarrespectively for the rst to sixth floors of the building served by theelevator car. In addition, the elevator car has mounted thereon twoinductor relays E and FQ These inductor relays may be of conventionalconstruction and are employed respectively for controlling the slowdownand stopping of the elevatorv car.V The inductor slowdown relay E isemployed for operating break contacts E1 and E2. This relay has anormally incomplete magnetic circuit. Consequently, energization of thecoil of the relay alone is insuilicient to operate the contacts. If theelevator car during' down travel approaches a floor at which it is tostop, the coil of the slowdown relay E is energized, and as the'carcontinues its approach, the inductor relay reaches an inductor plate DEPfor such oor. The inductor plate completes a magnetic circuit for therelay, which results in opening of the break contacts E2. It will beunderstood that a similar inductor plate is provided for each of theoors at which the elevator car A is to stop during down travel. Theopening of the contacts E2 initiates a slowdown operation of theelevator car.

If the elevator car A is to stop at a iioor during up travel, the coilof the relay E is again energized, and when the relay reaches theinductor plate UEP associated With the floor, a magnetic circuit iscompleted for the relay which results in opening of the break contactsE1. The opening of such contacts initiates a slowdown operation of theelevator car. A' similar inductor plate is provided for each of the oorsat which the elevator car is to stop during up travel thereof. It willbe understood that the inductor plates are mounted in the hoistway at`positions selected to provide suitable slowdown distances for theelevator car.

The inductor stopping relay F cooperates in a similar manner withinductor plates DFP and UFP. One of the inductor plates DFP is providedfor each of the oors at which the elevator car is to stop for downtravel thereof. One of the inductor plates UFP is provided for each ofthe iloors at which the elevator car A is to stop during up travelthereof. Operation of the break contacts F1 and F2, of the stoppingrelay F initiates a stopping operation of the elevator car. It will beunderstood that the inductory plates DFP and, UFP are positioned in thehoistway at suitable points to stop the elevator car accurately at eachof the associated floors.

YThe speed relay V is connected across the buses L1 andiLZ througheither of two parallel arms. One of these arms includes make contacts U4of the up switch U, a limit Switch 19 and the break contacts E1 of theinductor, slowdown relay E. The limit switch t9-is of conventionalconstruction. It is normally closed and is Opened aus the elevator carnears its upper limit of travel.

The second arm for the speed relay V includes in series the makecontacts D4 of the down switch D, a limit switch 20 and the breakcontacts E2 of the inductor slowdown relay E. The limit switch 2t) is anormally closed cam-operated switch which is opened as the elevator carnears its lower limit of travel.

For the running relay M to be energized, the make contacts DRl ofthedoor relay DR must be closed to indicate that all of the doorsassociated with the elevator car A are closed. Initial energization ofthe running relay M also requires closure of the break contacts 70Ti ofthe non-interference relay 70T to indicate that the elevatory car hasremained at its last stop for a period sufficient to permit discharge orentry of passengers, and ClQSlJle 0f theA break contacts 78-1 of theno-call relay switch is a cam-operated switch which is opened as the.

elevator car AV nears its upper limit of travel. When the ruiming relayM is energized through the first path, make,

contacts U5 close to complete a holding circuit around the contacts70T1, 78-.1 and W1.

The second path for initially completing the energization of the runningrelay M includes in series the make contacts X1 of the down preferencerelay X, the break contacts F2 of the inductor stopping relay F,normally closed contacts of a cam-operated limit switch 22 and the coilof the down switch D. The limit switch 22 is opened as the elevator carnears its lower limit of travel. When the running relay M is energizedthrough the second path, make contacts D5 close to complete a holdingcircuit around the contacts 70T1, 78-1 and X1.

Energization of the holding relay G and of. the inductor relays E and Frequiresv closure of the make con.- tacts M1 which occurs when the caris running. In addi-V tion, initial energization of these relaysrequires closure of one of four sets of contacts. Closure of makecontacts T1 occurs when the elevator car is to stop at the next Hoor inresponse to a registered car call. Closure of make contacts USTlindicates that the elevator car during up travel is to stop at the nextfloor reached by the elevator car in response to an up floor call whichis registered by a prospective passenger for such floor. Closure of themake contacts DST1 indicates that the elevator car during down travel isto stop at the next oor reached by the elevator car in response to adown floor call which is registered by a for such Hoor. Finally, dicatesthat the elevator and reverse at the next closure of make contacts J1incar during up travel is to stop oor which is the farthest iioor forwhich a car call or a down Hoor call is registered. When the holdingrelay G is energized, it closes its make contacts G1 to establish aholding circuit around the contacts T1, USTl, DST1 and J 1. v i

For the up preference relay W to -be energized, break contacts D6 and X2must be closed. In addition, the contacts of a normally closed limitswitch 24 must be closed. The limit switch 24 is cam operated to open asthe elevator car nears the upper terminal floor. It should be noted thatthe up preference relay W during an up trip of the elevator car remainsenergized as long as the limit switch 24 and the break contacts J2 ofthe reversing relay J are closed. If the contacts I2 open during suchtrip before the limit switch opens, the up preference relay W remainsenergized as long as the make contacts M2 remain closed.

For the down preference relay X to be energized the break contacts U6and W2 must be closed and a mechanical limit switch 25 must be closed.The limit switch 25 is normally closed and is cam operated to. open asthe elevator car A nears, its lower terminal oor.

It will be observed that for either the up or the down preference relayto be energized, at least one of ytwo parallel sets of. contacts, makecontacts M7 of the running relay M and relay 78, must be closed. As longas the elevator car is running, the running relay M is picked up and themake contacts M7 are closed. The break contacts 78-3 are closed as longas there is a call for service which may be answered by the elevator carA. If the elevator car A is stopped at a floor (contacts M7 are open)and if no be answered by the elevator call is registered which may car A(contacts 78-3 are open), the relays X and Y both prospective passengervbreak contacts 78-3 of the no-call- Will be dropped out. Desirably, thedown preference relay X has a slight time delay in pickup, i.e. the uppreference relay W has a priority in pickup over the down preferencerelay X.

The non-interference relay '70T is energized through the make contactsM3 as long as the elevator car is running. When the contacts M3 openduring the stopping of the elevator car at a iioor, the relay 70Tremains picked up for a predetermined time sufficient to permit entry ordischarge of passengers relative to the elevator car. The dropout timeof the relay may be determined in any suitable way and is represented bya resistor R2 which is connected across the relay coil.

The door relay DR is a conventional relay which is connected across thebuses for energization through door contacts. Each of the hoistway doorsfor the elevator car A and the car doors have contacts connected inseries with the door relay DR to permit energization of the door relayonly when all of the doors are closed and in safe condition.

For the reversing relay l to be energized, the break contacts X3 must beclosed to indicate that the elevator car is not conditioned for downtravel; the break contacts 78-2 of the no-call relay 78 must be closedto indicate that a call is registered which can be answered by theelevator car A; and the break contacts USTZ of the up stop relay USTmust be closed to indicate that an up floor call is not being answeredby the elevator car A. The initial energization of the relay I iseiected through make contacts 78U1 of the call-above relay 7 8U as theelevator car A approaches the farthest iloor in the up direction forwhich a call is registered. When energized, the relay l closes itsholding contact J3 for the purpose of establishing a holding circuitaround the contacts 78U1.

Floor stations are provided at the floors of the building at whichprospective passengers may register calls for elevator service. Thus,for the second floor `a push button 2F may be operated to register a oorcall. A similar push button is provided for each floor from which aiioor'call may be registered. These push buttons are common to all cars.

Also located at each floor is a car position indicator for each of theelevator cars of the system. Thus, for the second iloor, car positionindicators PI and BPI for the elevator cars A and B, respectively, areprovided. Similar-.car position indicators are located at each of theother floors for which elevator service may be provided. These carposition indicators continuo-usly indicate the positions of theirrespective associated elevator cars with respect to the floors of thebuilding. Since such car position indicators are well known in the art,it appears unnecessary to describe them further.

Figure 2 Pig. 2 illustrates the iloor call registering circuits for theelevator system. As heretofore mentioned, the push buttons 1F through6F, shown in the upper part of Fig. 2, are located respectively at theiirst to sixth floors and may be operated by prospective passengersdesirous of transportation to other iloors. lt will be understood thateach of the push buttons is biased towards contact open position. rIhesepush buttons are associated respectively with floor-call relays lDRthrough GDR. These iioor call relay circuits cooperate with a row e2through e6 of contact segments located on the tioor selector 16 of Fig.l. Associated with the contact segments e2 through e6 is a brush ee inseries with which are make contacts W3 of the up preference relay W andthe up stop relay UST, which has a time delay in dropout. This timedelay may be determined in any suitable way and is represented by aresistor R3 which is connected across the relay coil.

The lower part of Fig. 2 illustrates circuits for the down iloor-callregistering relays 1D through 6D and their associated canceling coilsIDN through 6DN, respectively. These registering circuits cooperate withthe two rows fl through f5 and g1 through gd of contact segments locatedon the iloor selector i6. Associated with these contact segments arebrushes ff and gg, respectively. in series with the brush ff are makecontacts X42 of the down preference relay X; in series with the brush ggare break contacts M4 of the running relay M.

The association of the various components of Fig. 2 may be understoodbest by consideration of certain representative operations. if aprospective passenger located at the second iloor desires transportationin the down direction, he presses `the push button 2F to energizethrough the normally open switch of the push button, the hoor-call relay2DR for the second iloor. This relay closes its maire contacts ZZDRi toenergize the down floor-call registering relay 2D. Opening of the breakcontacts 2DR?, has no `immediate effect on operation of the system. Therelay 2D closes its make contacts 2D1 to establish a holding circuitaround the contacts 2DR1. Thus, when the push button 2F is released, therelay drops out to open its contacts ZDRl; but the relay 2D remainspicked up. By inspection, it will be noted that the contacts 213i nowconnect, through the now closed contacts ZDRZ, the segment f2 for theelevator car A and a similar segment Bf for the elevator car E to thebus Li.

As the elevator car A while traveling in the down direction nears thesecond oor, the brush ff of the floor selector engages the contactsegment f2 to complete the following circuit:

(Note that since the elevator car is traveling yin the down directionthe make contacts X4 are closed.) The energized down stop relay DSTinitiates a stopping operation of the elevator car at the second iloor.

Upon continued motion of the elevator car A toward the second door, thebrush gg engages the contact segment g2. As the elevator' car stops atthe second floor, the heretofore open contacts M4 close to complete thefollowing circuit:

Li, anu, gz, gg, M4, L2

T he coil 2Di\ is a canceling coil which is wound on the saine core asthe coil 2D but which is energized in opposition thereto. Consequently,the energization of the canceling coil EDN results in neutralizing ofthe coil 2D and resetting of the registering relay. As the elevator carcomes to a stop, the brush ff preferably passes slightly beyond theContact segment f2. However, the brush gg preferably remains inengagement with the contact segment g2 as `long as the elevator car Aremains at the second iioor.

it should be noted that had the elevator car B answered the call at thesecond iloor the brush Bff would have engaged the Contact segment Ef?,to stop the car B. Furthermore, as the elevator car B neared the secondiloor, the brush Egg would have reached the contact segment .ig to resetthe registering relay 2D.

Assume that instead of approaching the second iloor while traveling inthe down direction the elevator car A approaches the second iioor whiletraveling in the up direction after the down floor call is registered bythe prospective passenger' at the second loor by pressing and releasingtw push button ZF, as` above described. lt will be observed "iat sincethe down preference relay X (Fig. l) is deer ized while the car A istraveling in the up direction, the make contacts Xd are open.Consequently, the down stop relay DST is unable to pick up to initiate astoppinry operation of the car as the car approaches the second 'lloorduring upward movement. The car, therei-lore, continues to moveupwardly, by-passing the second oor.

Assume next that the prospective passenger at the second'floor desires`transportation from the second Hooi' inthe up direction. Inste`ad`of'pressing and releasing the push'k button '2R the passenger' presses and.holds the button to maintain the normally' open switch thereof inclosed condition. As the ,elevator car A approaches the second floorduring up travel, thebrush ee engages .the contact segment e2 tocomplete the following circuit:

(Note that since the car istrayelingin the up direction the makecontacts W3 are closed.) The energized up stop relay UST initiates a"stopping operation of the elevator car Av at the secondv Hoor. i

Upon continued motion of the elevator car A toward the second iloor, thebrushgg engages the contact segment g2 to energize lthe canceling coilZDN, which thereby resets the registering relay 2D after the breakcontacts M4 close in the manner described above. Observe that had theelevator car B, While traveling inthe up direction, answered the upfloor call at the secondfloor, the brush Bee would have engaged thecontact* segment Be2 to stop the elevator car` B."'In addition,T as thecar B neared the second door, 'the brush Bgg would have reached thecontactY segment BgZ to reset the registering'relay 2D.

Circuits similar to those discussed for/the second oor are associatedwith each of the push buttons 2F through 5F for the intermediate floorsofv rthe building and maybe readily traced'in Fig. 2f inasmuch as theelevator car cannot stop at `the upper terminal floor during" downtravel,l a Contact segment in rthe f rowy is -not required for the sixthfloor. Since the elevator ca r A duringup travel must not move beyondthe upper terminal floor, a single contact segment e6 is' connectedpermanently toi the bus L1. Consequently, as the elevator car Aapproaches the sixth door the brush e engages the contac'tsegment e6 tostop the elevator` car A yat the sixth floor.

The oor-call registering circuits for the lirst or lower terminal floormay be similartolthose discussedfor the second oor. However, inasmuch asthe elevator car A must not move beyond tlie tirst iloor during downtravel thereof, a single contact segment f1 is connected permanently'tothe bus L1. Consequently, as the elevator car A approaches the firstfloor, the brushffferigages the contact segment f1 to stop theelevator'car A at'tlie first floor. Since `the elevator car A cannot stop at the lower terminal oor during up travel, a contact segment in thee row is not required for theiirst floorf l i Figure 3 The upper part ofFig. 3 illustrates circuits for register ing calls for floors desired bypassengers within'the elevator car. is eiec'ted'by operation of oneof/the car call push buttons 1c to 6c. VyFor example, when the puslibutton 2c is operated,"the carcall registering relay ZCR is con? nectedacross the buses L1 and L2. This relay closes its make contacts ZCRI toestablish a holding circuit around the push button 2c; It will beunderstood that each of the push buttons is biased towards contactpopenposition. Each ofthe pushbut-tons is similarly associated with one ofthe car-call registering relays'CR to viCR, respectively. `i

The car-call registering circuits have associated therewith four rows ofcontact segments 'which'are located on the floor selector 16 (Fig.V D1The rows of Contact segments b2 to be and c2 to c6. previously werementioned. IIn addition, each contact of a row of contact segments a1 toa5 is successively engaged by a brush aa during travel .of the elevatorcar and cooperatesjwith circuits for'initiating stops of the elevatorcar during up travel.' Each contact of a row of contact segments d1to'dS coac'ts with a brush da for the purpose nof lcanceling registeredcar calls which are answered during up travelof `the elevator Cal,

Registration of a c all for such a `passengery Y Position thereto- It isbelieved that the 'car-call stopping circuits can be ,understood best.by a presentation of representative operations. If the elevator car Ais to stop at the second floor during up travel thereof in response to areg'- istered car call,'the relay ZCR is energized and the contacts 2CR1are closed. As the car approaches the second Hoor, the brush bb engagesthe contact segment b2 to complete the following circuit:

L1, 2C1R1, b2, bb, W4, T, M5, LZ

The energization of the car-call stopping relay T results in stopping ofthe elevator car A at vthe second lioor.

As the elevator car nears the second floor, the brush dd engages thecontact segment d2 to complete the following circuit:

L1, ZCRI, ZCRN, d2, dd, W5, M6, LZ

The coil ZAC'RN is a canceling coil which is wound on the same core asthe coil ZCR but which is energized in `op- Consequently, theenergization of the Qaucsliug C Qil ZCR'N results .iu neutralizing oftho coil ZCR and resetting of the registering relay. As the elevator carcornes to a stop, the brush bb preferably passes slightly beyond thecontact segmelllS b2.

Let it be assumed next that `the car call for the second iioorisrregistered during down travel of the elevator car. AS the .elevatorCaf Hours thosoooud Hoor, the brush u engages the-contact segment a2 tocomplete the following circuiti: v

L1, .2.CR1, a2.. qq, xs, r, Ms. L2

The energization of the cars-call. stopping relay T resultsinfstoppingof theelevaltor carA at the second door. As the elevater carA continues tovapproach the second floor, Vthe brush cc engages-theContact segment .c2 to complete'the `following circuit:i i Y I` u. aoutmu, a ,Xo L2 Thecarcall registering circuits for the sixth or upperterminal oor may be similar to those for the second Hoor. However, sincethe elevatorcar Cannot stop. at the upper tortuilal 110.01 d uriug downtravel thereof, it follows that contact segments in the q and alv rowsare'not required for the upper terminal Hoo and are not shown for suchHoor iu FigA 3.f i

The carfcall registering circuits for the first or lower terminal flormay be similar to those discussed for the second floor. However, theelevater ca r cannot stop at tho lower terminal. floor during up travelvthereof. For this reason, contact segments in the b -and cl rows areuotjreaurod for the lower terminali lloor and are. not illustrated for.Such lloo iu Fla 3.

TlieI lower part of Fig. 3.7illustrates call-above'circuits for thoelevator .Cars- 'Thus the. elevator car A has a callfabovecircuit 3 6twhich includes in series break contacts of `a,ll,of-t he callregisteringrelays for floors above the secondlloor. The call-abovecircuit is associated with contact segments through m6 are located in arow in thefloor selector'.l The call-above circuit controls theenergization of the call-above relay .78,U, which is connected throughmake contacts W6 of the up preference relail W between a brushmjin,which cooperates with the Contact segments, and the b us Byinspectionof'Fig. V3,'it'will benoted :that the break contacts of theregistering relays are connected between the bus L1 and the contactsegment m2 as follows:

L1, 6CR2, 6D2, SCRZ, 5D2, 4CR2, 4D2, 3CR21, 3D2, m2

Each of the contact segments m2. through m is connected to thecall-above circuit at a point such that contacts for the registeringrelays requiring travel of the elevator car A above the door representedby any contact segment are all located above such contact segment. Thus,the contact segment m5 is connected to the call-above circuit betweenthe break contacts eD2- and SCRZ. The contact segment m4;- is connectedto the call-above circuit between the break contacts SDZ and ACRZ. Thecontact segment m6 is permanently connected to the bus L1. The remaining connections are clear from Fig. 3. The brush mm engages and leaveseach of the contee segments during up cai` travel in advance of theassociated hoor.

By inspection of Fig. 3, it will be observed that as long as a call isregistered requiring travel of the elevator car to a floor above theposition of the elevator car A, the call-above relay 7SU cannot beenergized through the call-above circuit.

A circuit connects the no-call relay 78 between the contact segment m2and the bus L2 through the seriesconnected break contacts ZCRZ, ZDZ,ICRZ and 1DZ. if no call which may be served by the elevator car A isregistered, the relay 78 is energized and picked up. As long as such acall is registered, however, the relay is deenergized and dropped out.

Operation-Figs. 1, 2 and 3 In order to facilitiate an understanding ofthe elevator system, some typical operations of the system will beconsidered. It will be assumed first that the elevator car A is locatedat the first floor. It will be assumed further that down fioor calls areregistered at the second and fifth floors by the pressing and releasingof the push buttons 2F and 5F, respectively (Fig. 2). As a result oftheir energization in the manner heretofore described, the floor callrelays 2DR and SDR close their make contacts 2DR1 and 5DR1,respectively, to pick up the down fioor-call registering relays 2D and5D. The opening and closing of the break contacts 2DR2 and SDRZ upon thepressing and releasing, respectively, of the push buttons 2F and 5F haveno immediate effect on operation of the system. Closure of the makecontacts 2D1 and 5D1 establishes self-holding circuits for the relays 2Dand 5D, respectively. Opening of the break contacts 2D2 and SDZ (Fig. 3)in the call-above circuit 36 results in deenergization of the no-callrelay 78. Inasmuch as the elevator car A is at the first floor, thebrush mm is not in engagement with a contact segment, and the call-aboverelay 'SU is, therefore, dropped out.

The down Hoor-call registering relays 2D and 5D also open their breakcontacts 2D3 and 5D3, respectively, in the call-above circuit B36 forthe elevator car B. The present discussion, however, will be confined tothe operation of the elevator car A.

Referring to Fig. 1, it will be noted that the deenergized callnbevereiay EAU maintains its contacts 73H1 open to prevent energizationtherethrough of the reversing relay I. The no-call relay 78 closes'itsbreak contacts 78-1 to permit energization therethrough of thecar-running relay M and the up switch U.l Contacts 78-2 close to permitenergization therethrough of the reversing relay.-

Closure of the break contacts 7 8-3 establishes the following energizingcircuit for the up preference relay W;

L1, I2, D6, X2, W, 24, 78-3, L2

(Note that the down preference relay X cannot pick up, since the limitswitch Z5 is open, inasmuch as the elevator car A is positioned at thefirst fioor.) The car A now is conditioned for up travel.

It will be assumed that the elevator car A has remained at the lowerterminal floor for a time sufficient to permit the non-interferencerelay T to time out and close its break contacts 70T1. It will beassumed further that the doors associated with the elevator car A areall closed and that the door relay DR is energized to close its makecontacts DRl. The doors may be of any conventional type. For example,they may be manually opened and spring closed or they may be poweroperated in both directions, if desired.

Since the contacts 70T1, 78-1, W1 and DRI are closed, the followingcircuit is established:

L1, 70T1, 78-1, W1, F1, 21, U, M, DRI, LZ

The energized up switch U closes its make contacts U1 to energize thebrake coil 17B for the purpose of releasing the elevator brake. ContactsUZ and U3 close to connect the generator field winding TLSF forenergization with proper polarity for up travel of the elevator car.Contacts U4 close to complete an energizing circuit for the speed relayV. This relay closes its make contacts V1 to shunt the resistor R1. Theelevator car now accelerates in the up direction.

Closure of the make contacts U5 establishes a holding circuit for therelays U and M around the contacts 70T1, 78-1 and W-1. Opening of thebreak contacts U6 has no immediate effect on the system operation.

The energization of the running relay M results in closure of thecontacts M1 to prepare the relays G, E and F for subsequent operation.Closure of the make contacts M2, M7 and M5 (Fig. 3) and opening of thebreak contacts M4 (Fig. 2) and M6 (Fig. 3) have no immediate effect onthe operation of the system.

Closure of the make contacts M3 (Fig. l) energizes the non-interferencerelay 70T, which opens its contacts 7ilT1. Because of the holdingcircuit established through the contacts U5, opening of the contacts MT1has no immediate effect on the operation of the system.

Since the iloor-call push button 2F has been released, the up stop relayUST (Fig. 2) cannot be energized as the elevator car proceeds upwardlyand the brush ee engages the contact segment e2. Consequently, theelevator car A continues to move toward the fifth floor.

As the car A approaches the fifth floor, the brush mm (Fig. 3) engagesthe Contact segment m5 to complete the following circuit:

L1, 6CR2, 6D2, m5, mm, W6, 78U, L2

The energized call-above relay 78U closes its make contacts 7SU1 (Fig.l) to complete an energizing circuit for the reversing relay I. Thisrelay, in turn, closes its make contacts I1 to complete an enrgizingcircuit for the relays G, E and F. Opening the break contacts l2prepares the up preference relay W for subsequent deenergization.Closure of the make contacts J3 establishes a selfholding circuit forthe relay 5 around the contacts 78U1. Energization of the holding relayG results in closure of the make contacts G1 to establish a holdingcircuit around the contacts J 1.

In response to continued movement of the elevator car A toward the fifthfioor, the inductor slowdown relay E is horizontally aligned with theslowdown inductor plate UEP for the fifth floor to complete a magneticcircuit which results in opening of the break contacts El, Such openingdeenergizes the speed relay V, which opens its make `contacts V1 toinsert the resistor R1 in series with the generator field winding 15P.As a result of the decreased energization of the field winding, theelevator car A slows to a landing speed.

Continued movement of the elevator car A toward the fifth fioor bringsthe inductor stopping relay F into hori- 4zontal alignment with inductorstopping plate UFP for yrelay M.

The up switch U now opens its make contacts Uf to deenergize the brakecoil 17B.Y isV "biased against the drum i7. VIn addition, the makecontacts lU2l and U3 open to deenergizethe generator field winding I SF,and the elevator car A stops accurately at theY fth tloor. Opening'ofthemake contacts U4 and U and closure of the break contacts U6 have noimmediate eect on the operation of the system.

The running relay M when deenergized opens its make contacts M1 todeenergize the relays E, G and F. As the car stops, the inductor relaysmay pass beyond their cooperating inductor plates. The holding relay Gopens its self-holding contacts G1. Opening of the make contacts M5l(Fig. 3) and closure of the break contacts M6 have no immediate eitecton the operation of the system.

As is noted above, the energization of' the reversing relay I resultedin opening of the break contacts J2. As the elevator car A stops, thecontacts M2 of the running relay M also open to deenergize the uppreference relay W. The deenergized relay W opens its make contacts W1,W3, W4, W5 and W6 and closes its break contacts W2. Closure of the breakcontacts W2 completes an energizing circuit for the down preferencerelay X, and this relay closes its make contacts X1, X4, X5 and X6 andopens i'tsbreak contacts X2 and X3. Consequently, the elevator car A nowis conditioned for down travel. It'sh'ouldfbe noted that the elevatorcar has stopped during up travel at a oor in response to a registereddown oorcall which is the farthest down oor call in the up direction.

Closure of the make contacts X1 prepares the down switch`D forsubsequent energization. Opening'of the break contacts X2 and X3prevents subsequent energization therethrough of the relays W and I,respectively. Closureof the' make contacts X4 (Fig. 2) prepares thedown'stop relay DST for subsequent energization. Closure of the makecontacts X5V and X6 (Fig. 3) has no immediate effect on operation.

` The make contacts M3 in opening deenergize the noninterferencerelay79T and thisrelay starts to time out.- Until'therelay times out, thecontacts 70T1 remain open to prevent further starting of the elevatorcar.

During thestopping of the elevator carA at the fth oor, the' brush gg(Fig. 2) engaged the contact segment g5. inasmuch as the break contactsM4 were then closed,"the 'following canceling circuit was completed:

L1.l 5151, SDN, agar/14, L2

As a result of the energization of the canceling coil SDN, theregistering relay 5D is reset and opens its holding contacts SDI.Closure of the break contacts 5D2 (Fig. 3) in the call-above circuit 36has no immediate effect on the operation of the elevator car A. Closureof the break contacts 5D3 in the call-above circuit B36 of ele-v vatorcarB is assumed to have no immediate effect on the operation of thesystem.

i'The'no-call'relay V78 remains deenergized since the break contacts 2D2are open as a result of the previous registration of the down iioor callfrom the second Hoor. Thus, opening of the make contacts M7 (Fig. `1) asa result of' deenergization'of the 'running relay M has no immediateeifect on operation, since the parallel break contacts 78-3 remainclosed. A` AfterIV atim'e sufticient'to permit dropout of thenoninte'rference relay 70T (Fig. l) and after the doors associatedwithVthe elevator car A` are closed, the following circuit is established: c

L1, 76T1, '7S-ll, X1, F2, Z2, D, M, DRL L2 The energized down switch Dcloses its make contacts D1 to :energize the brake coil for the purposeof releasing ContactsDZ and D3 close to energize the The brake shoe 17Snow the brake. field winding ISF with proper polarity for down travel ofthe elevator car. Contacts D4- close to energize the speed relay V. Thisrelay closes its make contacts V1 to shunt the resistor R1. The elevatorcar now accelerates in the down direction.

14 Closure of the make contacts D5 establishes a holding circuit aroundlthe contacts 70 T1, 781 and X1. Opening ofthe break contacts D6 has noimmediate eitect on the operation of the system.

The car running relay M operates in the manner previously described.

A s the elevator car proceeds downwardly, the brush ff engages thecontact segment f2 (Fig. 2) to complete the following energizingcircuit:

L1, 2D1, 2DR2, f2, ff, X4, DST, L2

The energized down stop relay closes its make contacts DSTl (Fig. l) tocomplete the energizing circuit forthe energizing circuits G, E and F.The relay G closes its holding contacts G1 to establish a holdingoircuit around the contacts DSTl.

' Whenthe inductor slowdown relay E comes into horizontal alignment withthe slowdown inductor plate DEP for the second floor, a magnetic circuitis completed which results in opening of the break contacts E2 todeenergize the speed relay V. This relay opens its make contacts V1 tointroduce the resistor Rl in series with the generator'teld. winding ISFand the elevator car A slows to a landing speed. When the stopping relayF reaches the stopping inductor plate DFP for the second floor, amagnetic circuit is completed which results in opening of the breakcontacts F2 to deenergize the down switch yD and the running relay M.""When deenergized, the down switch D opens `its make contacts D1 todeenergize the brake coil 17B. Consequently, the brake shoe 17S isapplied against the brake 17. In addition, the make contacts D2 and D3open to deenergize the generator iield winding 15P, and the elevator carstops accurately at the second oor. As the car stops, the inductorrelays may pass beyond the range in which their cooperating magneticplates complete ithe magnetic circuits therefor. Opening of the makecontacts D4 and D5 has no immediate effect on the operation of thesystem. The running relay M, when deenergize'd, operates substantiallyin the manner previoupsly discussed with the exception of the eltect ofthe opening of the make contacts M7, as hereinafter explained.

During the stopping of the elevator car A at the second oor, the brushgg (Fig. 2) engaged the contact segment g2. Inasmuch as the breakcontacts M4 then were closed, the following canceling circuit wascompleted:

L1, 2131,2DN, g2, gg, M4, Lz

As a result of the energization of the canceling coil ZDN, theregistering relay 2D is reset and opens its holding contacts 2D1.Closure of the break contacts 2D2 (Fig. 3) results in energization ofthe no-call relay 78 for the elevator car A. Closure of the breakcontacts 2D3 results in pickup of the no-call relay B78 for the elevatorcar B.

Opening of the break contacts 78-1 and B78-1 (Fig. 1) preventsenergization of the running relays M and BM. Thus, until another callfor elevator service is registered, the car A will remain parked at thesecond iloor and the car B will remain parked at that oor for which itlast provided service.

Opening of the break contacts 'IS-2 has no immediate elect on operation.Opening of the break contacts 78-3 prepares the down preference relay Xfor subsequent deenergization; Such deenergization occurs upon dropoutof the running relay M and the accompanying opening of its make contactsM7. Note that since both the up and the down preference relays W and X,respectively, now are dropped out, the elevator car A is not'conditioned for travel in either the up or the down direction, i.e., aslong as there is no call for service which may be answered by theelevator car A, no direction preference is established for the car.

Next, it will'be assumed that a passenger who entered the elevator carat the second hoor registered a car call for the rst floor by operationof the car-call push button ELC (Fig. 3). The resulting pickup of thecar-call registering relay ltCR is accompanied by closure of its makecontacts lCRl to establish a self-holding circuit for the relay. Openingof the break contacts lCRZ results in dropout of the rio-call relay 78.

Closure of the make contacts 7s-Il (Fig. l) partially completes anenergizing circuit for the running relay M. Closure of the breakcontacts 7S-2 and '7S-3 results in the following sequence of operation:The up preference relay W rst picks up, since the down preference relayX has a delay in pickup, as heretofore mentioned. Closure of the makecontacts W6 (Fig. 3) results in pickup of the call-above relay 78U,which is accompanied by closure of the make contacts 78U1 (Fig. l) topick up the reversing relay T. Closure of the make contacts I3 has noimmediate effect on operation for the reason that the make contacts FUllstill are closed. Opening of the break contacts I2 causes the uppreference relay W to drop out. Closure of the break contacts W2 resultsin the completion of an energizing circuit for the down preference relayX through the closed contacts 7345. Opening of the make contacts W6(Fig. 3) drops out the call-above relay 73U. Opening of the breakcontacts X3 (Fig. l) drops out the reversing relay I, but closure of thebreak contacts I2 cannot effect pickup of the up preference relay W,since the break contacts X2 now are open.

Thus, the elevator car A now is conditioned for travel in the downdirection. After a lapse of time sufficient to permit entry anddischarge of passengers relative to the elevator car A, the car Aproceeds to the lower terminal lloor by a sequence of operations whichWill be clear from the preceding discussion.

lt will be observed that the elevator system as thus far described hasprovided down collective service for the floors for which corridor callswere registered.

For the next example, it will be assumed that the elevator car A ismoving upwardly from the first floor in response to a car call for thefourth floor and that a prospective passenger located on the third floordesires elevator service from such floor in the up direction.

As was mentioned heretofore, a car position indicator is located at eachfloor for each of the elevator cars of the system. A prospectivepassenger may be informed thereby of the position and direction ofmovement of each of the elevator cars. Thus, by observing the positionindicator located at the third floor for the elevator car A, theprospective passenger in the present example notes that the car A ismoving upwardly toward the third floor. The passenger previously hasbeen instructed that the pressing and holding of a floor call pushbutton will result in the stopping of an up-moving car at his iloor. He,therefore, presses and holds the oorcall push button 3F in its actuatedposition for the few seconds immediately preceding the arrival of thecar A at the third floor.

The holding of the push button 3F as the brush ee (Fig. 2) engages thecontact segment e3 establishes the following energizing circuit:

Lil, 3F, e3, ee, W3, UST, LZ

Closure of the make contacts USTl (Fig. l) complates an energizingcircuit for the relays G, E and F. The energization of these relayscauses the elevator car A subsequently to stop at the third floor in amanner which will be apparent from the preceding discussion.

Assume next that the up floor call for the third floor in the precedingexample is the only call registered in the system. The engagement of thebrush mm (Fig. 3) with the contact segment m3 as the elevator car Aapproaches the third l'loor then results in energization of thecall-above relay 'taU before the call is canceled to pick up theno-callrelay 7S to open the latters break contacts 78-2 (Fig. l). Whenenergized, the relay 78U closes its make contacts 7SUIt. Energization ofthe reversing relay .l is prevented, however, since the pickup of the upstop relay UST also resulted in opening of its make contacts USTZ. Thus,the break contacts I2 remain closed. When the up loor call for the thirdfloor is cancelled and the no-call relay '7S picks up as a resultthereof, its break contacts f3-3 open to drop out the up preferencerelay W, which results in closure of the break contacts W2. However,since both of the contacts M7 and PS-i open as the car stops at thethird floor, the down preference relay X cannot be energized through theclosed contacts W2.

It will be recalled that the up stop relay UST has a time delay indropout. rlfhis delay is sufficient to enable the prospective passengerat the third floor, after he releases the push button 3F and theelevator car A stops at the third iloor, to enter the car and register acar call for a floor above before the relay UST times out to close itsbreak contacts USTZ. Assume, for example, that the passenger presses thepush button 5C (Fig. 3) to register a car call for the fifth lioor. As aresult thereof, the no-call relay 73 drops out to close its breakcontacts '78-2 and '7S-3 (Fig. l); but the call above relay 78U isdropped out, and its make contacts 78U1 are therefore open, thuspreventing energization therethrough of the reversing relay l when theup stop relay UST times out to close its contacts USTZ. (it will berecalled that the brush mm leaves each of its associated contactsegments during up car travel in advance of the arrival of the elevatorcar at the associated floor.) The up preference relay W, therefore,picks up through the contacts JZ and 7S-3, and the elevator car Athereby again becomes conditioned for up travel. (It also will berecalled that the down preference relay X has a slight time delay inpickup, enabling the up preference relay W to pick up first; opening ofthe contacts WZ prevents energization therethrough of the downpreference relay X.)

After a time sutiicient to permit dropout of the noninterference relay7M and after the doors associated with the elevator car A are closed,the car A proceeds to the fth floor, in response to the car callregistered by the passenger, by a sequence of operations which will beclear from the foregoing discussion. f no call which may be answered bythe elevator car A remains in the system, it will be understood from thepreceding discussion that cancellation of the car call for the fifthfloor results in the parking of the elevator car A at the fifth door andthe establishment of no direction preference for the car.

Referring to Fig. 2, it will be observed that when a passenger whodesires up service from one of the intermediate floors of the buildingpresses and holds one of the push buttons ZF through 5F, one of thebreak contacts ZDRZ through SDR?. associated with that push button ismaintained in open condition as long as the push button is held. Forexample, if the push button 2F is pressed and held, the floor call relay2DR picks up to open its break contacts ZDRZ. Opening of the breakcontacts ZDRZ prevents a down moving elevator car from answering thecall for up service from the second floor. Thus, if it is assumed thatthe elevator car B is traveling in the down direction while the switchcontacts of the push button 2F are closed, the open contacts 2DR?,prevent energization therethrough of the down stop relay BDST for theelevator car B when the brush Bff engages the contact segment Bf2 as thecar B p approaches the second floor.

In the event that both a prospective up passenger and a prospective downpassenger desire elevator service from the same door, the car positionindicators provided for that oor willL indicate to such passengers whento press and hold their floor call push button to stop an up-moving carand when to press and release the button to stop a down-moving car. Forexample, if both a prospective up passenger and a prospective downpassenger desire service from the second oor, and if the elevator car Ais approaching the second floor in the up direction, as indicated by thecar position indicator Pl (Fig. 1), the prospective up passenger at thesecond floor is informed thereby that he must press and hold theoor-call push button 2F in order to stop the car A for up service.Subsequently, the prospective down passenger at the second lioor willpress and release the button 2F to register a call for down service, asa result of which the next downmoving car will stop at the second oor.

From the foregoing discussion of operation, it will be seen thatelevator system herein described, while basically a down collectivesystem, has been provided with an up collective feature.

Although the invention has been described with reference to certainspeciic embodiments thereof, numerous modifications falling within thespirit and scope of the invention are possible.

I claim as my invention:

1. An elevator system comprising a structure having a plurality oflandings, an elevator car, means mounting the elevator car for movementin two directions relative to the structure to serve the landings, andmotive means for moving the elevator car relative to the structure, incombination with control means operable in cooperation with the motivemeans to move the elevator car relative to the structure and to stop theelevator car at predetermined landings, said control means includingcall registering means for registering calls for elevator service fromthe landings, said call registering means comprising only a singlemovable member disposed at each of said landings, first control meansresponsive to a rst mode of operation of each of said members in a iirstposition for registering calls for elevator service in a rst directionfrom the landings, and second control means responsive to a second modeof operation of each of said members in said iirst position forregistering calls for elevator service in a second direction from thelandings.

2. An elevator system comprising a structure having a plurality oflandings, an elevator car, means mounting the elevator car for movementin two directions relative to the structure to serve the landings,motive means for moving the elevator car relative to the structure, incombination with control means operable in cooperation with the motivemeans to move the elevator car relative to the structure andto` stop theelevator car at predetermined landings, and call registering means forregistering calls for elevator service from the landings, said callregistering means comprising only a single movable member disposed ateach of said landings, said call registering means including meansresponsive to movement of each of said members to a irst position forregistering calls for elevator service in a first of said two directionsfrom each of the landings for which said member is moved to said iirstposition, and modifying means responsive to the maintenance of each ofsaid members in said rst position as the elevator car approaches each ofthe landings for which a member is maintained in said first positionwhile traveling in the second of said two directions for registeringcalls for elevator service in said second direction from the last-namedlanding.

3. An elevator system comprising a structure having a plurality oflandings, an elevator car, means mounting the elevator car for movementin two directions relative to the structure to serve the landings,motive means for moving the elevator car relative to the structure, incombination with control means operable in cooperation with the motivemeans Ito move the elevator car relative to the structure and to stopthe elevator car at predetermined landings, and means comprising only asingle movable member disposed at each of said landings operable forregistering calls for elevator service from the landings, said controlmeans comprising rst control means responsive to the movement of each ofsaid members to a iirst position for moving and stopping the elevatorcar to provide a first predetermined service for each of the landingsfor which said member is moved to said iirst position, and modifyingmeans lresponsive to the maintenance of each of said members in saidfirst position as the elevator car approaches each of the landings forwhich a member is maintained in said first position while traveling in afirst of said two directions for modifying the moving and stopping ofthe elevator car to provide a second predetermined Service for each ofthe landings for which said member is operated in the last-named manner.

4. An elevator system comprising a structure having a plurality oflandings, an elevator car, means mounting the elevator car for movementin two directions relative to the structure to serve the landings,motive means for moving the elevator car relative to the structure, incombination with control means operable in cooperation with the motivemeans to move the elevator car relative to the structure and to stop theelevator car at predetermined landings, and means comprising only asingle movable member disposed a each of said landings operable forregistering calls for elevator service from the landings, said controlmeans comprising first control means responsive to the movement of eachof said members to a lirst position for moving said elevator car toprovide elevator service from each of the landings for which said memberis moved to said iirst position, second control means responsive to themovement of each of said members to said rst position for stopping theelevator car to provide elevator service in a first of said two-directions from each of the landings for which said member is moved tosaid lirst position, and third control means for stopping the elevatorcar to provide elevator service in lthe second of said two directionsfrom each of the landings for which said member is maintained in saidrst position as the elevator car approaches the last-named landing insaid second direction but not in the iirst of said two directions.

5. An elevator system comprising a structure having a plurality oflandings, an elevator car, means mounting the elevator car for movementin two directions relative to the structure to serve the landings,motive means for moving ythe elevator car relative to the structure, incombination with control means operable in cooperation with the motivemeans `to move the elevator car relative to the structure and to stopthe elevator car at predetermined landings, car-call means operable fromthe elevator car for registering a call for each of the landings desiredfor the load within the elevator car, landing call means comprising onlya single movable member disposed at each of the landings operable forregistering calls for elevator service from the landings, said controlmeans comprising means responsive to the movement of each of saidmembers to a iirst position for moving the elevator car and for stoppingthe elevator car to provide service in a iirst of said two directionsfrom each of the landings for which said member is moved Ito said iirstposition, reversing means for causing the elevator car while travelingin the second of said two directions to stop and to condition theelevator car for subsequent travel in the first direction at thefarthest landing in the second direction for which a landing call isregistered provided no car call is registered requiring further travelof the elevator car in the second direction, and modifying meansresponsive to the presence of each of said members in said firstposition as ythe elevator car approaches in the second direction alanding for which said member is so operated for stopping the elevatorcar at the last-named landing, for rendering said reversing meansineifective for a predetermined time to condition the elevator car forsubsequent travel in the irst :direction although no landing call and nocar call previously has been registered requiring further travel 'ofithe elevator car in the second direction and or'permittingtheregistration of Aa car call in response to operation'ofsaidfcar-callmeans during such predetermined 'time-for a landingrequiring furtherv travel of the-elevator car 1in the secondV direction."'6. An elevatorfsystem comprising 'a structure' having a plurality oflandings including rstand second terminal landings an'd a plurality of'landings "intermediate the terminal landings, ari-elevator `c`ar,`meansmounting the elevator carfror movement in two directions relative to thestructure to servev the-landingsjmotive-means for moving the elevatorvcar relative tothe strcturej incombination with control means operablein cooperatinwith the"motive means to--move the elevatorcar relative tothe structure and to stop thefelevator -car y"at-predetermined landings,and l"bypassing Ameans operable from each' of said `intermediatelandings 'for preventing said elevator car from'sitopping ata landingforwhich s'ai'd bypassing means is operated.

7.In an elevator'rsvystemtor a-structure having a 'plurality oflandings-includingfrst and second terminal landings 'and a plurality ofHlandings intermediate the terminal landings, a plurality of elevatorcars, means mounting the elevator cars for yrnovementfin 'two directionsrelative to lthe structure to `serve said landings; motive means formoving each of the elevator cars -relative to the structure, and controlmeans operable'i'n-cooperation -with the motive means to'move theelevator cars relative to the structure and to stop the elevator cars atpredetermined landings, and means comprising only a single movablemember disposed at each of said landings for registering calls forelevator-service from the landings, said control means comprising firstycontrol means responsive to the movement of each of said members to afirst position for moving said elevator cars and for'stopping' saidelevator cars'to provide service in a iirst of said tw'o directions fromeach of the'landings for which said member is moved'to Vsaid firstposition, and modifying means responsive tothe maintenance of each ofsaid members'in said first position as an elevator car approaches in thesecond of said two directions a landing for which said member is sooperated for stopping the last-named elevator car at the last-namedlanding and `for preventing any elevator car which approaches thelast-named landing yinv said rst direction from stopping at suchlanding.'

8. In an elevator system for a structure having a plurality of landingsincluding rst and second terminal 2) landings and a plurality oflandingsintermediate the terminal landings, a plurality of elevator cars, meansmountingithe elevator carsv for movement in two directionsrelative'tothestructure to servicevsaid landings, motive meansfor movingeach of the` elevator cars relative Ito the'structure, control meansoperable in cooperation vwith the` motive means to lmove the elevatorcars relative to the structure and tostopthe elevator cars atpredetermined landings, car-call means-operable fromeachzofttheelevator, cars for registering a call for each of thelandings desired for thev load within the associated elevator car,landing call vmeans comprising only a single movable memberdisposed ateach of the `landings operable for registering calls for elevatorservice from the landings, saidvtcontrol means comprising meansresponsive to the movement of. each ofsaid members to a rst position formoving the elevator cars and for stopping the elevator cars .to provideservice in a irst of said two .directions from each of thelandings forwhich said member is moved to saidrst position, reversing means forcausing each of the elevator cars-while traveling in the `second of saidtwo directions -to stop and forA conditioningsuch elevator Car forsubsequent travel. in the first direction at the farthest landinginthe-second direction for whichna landingk call is registered which maybeanswered byfsuch elevatorcar provided no car call is registeredre'quiringrfurther-travel of--such elevator car in thevsecond-direction, -and modifying means'responsiv'e to the maintenancefof each ofl said Ymembers 'in said first position as an Velevator 'car,approachesin the second direction a'landing for which said member is sooperated for stopping the last-named elevator car at the last-namedlanding,for rendering 'said reversing means ineffective forapredetermined timeto condition said last-named elevator car forsubsequentftravel inthe-first direction althoughI no landing call fan'dno car call previously has been registered "requiring Vfurther travel ofsaid lastnamedelevator car in the second direction, for permittingtheregistration of al car callin response to operation of the car-callmeans for saidVlas't-named elevator car during :such'predetermined timefora landing requiringff-urth'erl travel of 'said`last-named elevatorcar in .the second direction, and for preventing Vany elevatorcarwhicliappro'aches V'said last-named landing in said first direction-fromstopping `at saidlast-named landing providednio'car -call -is"registeredfor-suchV elevator carfor said 'last-named.' landing.'

No `references cited.

